[MarcusWolschon]

Does anyone have a formula to calculate the length of the arc described by a movement of a single G1 command involving the X, Y, Z and A axis?
I'd like to compensate the Feedrate to keep a constant speed on the surface of the milled object (with a maximum Feedrate in case the tip of the tool doesn't move è. G. While moving around a sharp corner)


This is for
https://code.google.com/p/simplemultiaxiscam
My simply 4 axis CAM program.

[MarcusWolschon]

Thinking about it...
A G1 command lists linear and rotational axes.
For only linear axes the speed given be the F parameters is the speed of all 3 axis combined in mm/min.
For only a rotational axis the speed is interpreted as degrees/min (thus the actual linear speed depends on the radius)

How do you actually set the speed of a G1 command that involves linear and rotational axes in one move and what is the unit?
What about a movement that rotates a tool using it's tip as the center of rotation(no linear movement despite all lines axes moving) .